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Effect of superplasticizer on workability and flexural strength of autoclaved calcium silicates
Investigations are reported into the effects of superplasticizer type and dosage on the workability of a cement-silica mix with a range of liquid/solids ratios and on the flexural strenght after autoclaving. The overall objective was to achieve as high strength as possible from pourable mixes. The results showed that flexural strenghts as high as 25 MPa could be achieved by using an optimum combination of superplastisizer type, dosage and liquid/solids ratio. Such mixes had excellent flow characteristics enabling direct casting without any assistance from vibration. The dosages of superplasticizer per unit weight of cement plus fine silica, were found to be similar to those for normal cement, with 2 % giving optimum benefits. A critical 0.25 liquid/solids ratio was found below which strength decreased and above which the conventional dependency found with cementitious systems was observed.
Effect of superplasticizer on workability and flexural strength of autoclaved calcium silicates
Investigations are reported into the effects of superplasticizer type and dosage on the workability of a cement-silica mix with a range of liquid/solids ratios and on the flexural strenght after autoclaving. The overall objective was to achieve as high strength as possible from pourable mixes. The results showed that flexural strenghts as high as 25 MPa could be achieved by using an optimum combination of superplastisizer type, dosage and liquid/solids ratio. Such mixes had excellent flow characteristics enabling direct casting without any assistance from vibration. The dosages of superplasticizer per unit weight of cement plus fine silica, were found to be similar to those for normal cement, with 2 % giving optimum benefits. A critical 0.25 liquid/solids ratio was found below which strength decreased and above which the conventional dependency found with cementitious systems was observed.
Effect of superplasticizer on workability and flexural strength of autoclaved calcium silicates
Superplastifizierwirkungen auf Verarbeitbarkeit und Biegefestigkeit von autoclaviertem Calciumsilicat
Shirkavand, M. (author) / Baggott, R. (author)
Cement and Concrete Research ; 25 ; 1512-1522
1995
11 Seiten, 7 Bilder, 7 Quellen
Article (Journal)
English
Portlandzement , Siliciumoxid , Gehalt (Zusammensetzung) , Wechselwirkung , Biegefestigkeit , flüssiger Zustand , mechanische Eigenschaft , Pore , Bruchmechanik , Rheologie , Siliciumdioxid , Korrelation , Fluid , Porenweite , Bearbeitbarkeit , Calciumsilicathydrat , Wasserabbinden von Zement , Wasser-Zement-Wert , Weichmacher , Autoklavierung , Bruchspiegel , Porengröße , Tricalciumaluminat
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